AT&T could get a lot more serious about rivaling Google Fiber. The service provider is beginning to investigate the potential for expanding its GigaPower internet service into up to 21 new major metropolitan areas, including San Francisco, Los Angeles, Chicago, and Miami. The announcement does not mean that all of these cities will definitely be seeing AT&T's one-gigabit-per-second fiber service in the near future though — instead, AT&T is only announcing that it will begin discussions with city leaders in each of these areas about a possible launch. "We’re interested in working with communities that appreciate the value of the most advanced technologies and are willing to encourage investment by offering solid investment cases and policies," Lori Lee, an AT&T home solutions executive, says in a statement.